Path-Q Solar

When should a business obtain an independent production estimate before approving a solar project?

Answer

An independent production estimate is most worthwhile when the project is financially material, the site has complex shading or multiple roof areas, the proposed production is central to repayment or savings, or installer estimates differ substantially.

Key points

  • Use the estimate before final approval, contract signing, or an irreversible financing commitment.
  • Provide the independent reviewer with the same site, usage, equipment, and shading information used by the installer.
  • Compare annual and monthly production assumptions, not just the headline savings figure.

What it depends on

  • Project cost and the business's tolerance for production shortfalls
  • Roof complexity, shading, and available production data
  • Financing structure, operating hours, and future load

Risks and trade-offs

  • An independent estimate adds time and cost but can reduce the risk of approving an overstated project.
  • Different models can produce different results without either being intentionally misleading.
  • Production does not by itself determine savings; consumption timing and billing terms also matter.

Information you may need

  • Installer proposals and production models
  • Interval or monthly electricity use and operating schedule
  • Roof plans, shading information, equipment specifications, and financial assumptions

Your next step

What to do next

Before approval, obtain a qualified independent review if the project exposure or uncertainty is significant, and require the installer to explain any material difference.

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